JPH08319126A - Formation of glass cell - Google Patents

Abstract

PURPOSE: To form a glass cell in high accuracy by shortening the cycle time of a formation, by forming the glass cell under a specific condition in a method for forming the glass cell in a predetermined way. CONSTITUTION: In this method for forming a glass cell in which a core is inserted inside of a glass material 5, which is a heated and softened glass parison, and a glass cell is formed by suctioning the inside of the glass material 5, it is preferable to constitute a cavity B outside of the glass material 5, flow a gas into the cavity B through e.g. a pressure intensifying pipes 16a and 16b and form the glass cell by adding pressure outside of the glass material 5 during formation and, at the same time, suck a cavity C formed by the outer surface of the core and the interior surface of the glass material 5 to reduce the pressure. Thus, the glass material 5 is formed so as to be adhered to the core by a pressure increasing action in the outside and a pressure reducing action from the inside.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for molding a glass cell used in an analyzer.

[0002]

2. Description of the Related Art Conventionally, as a method for molding a glass cell used in an analyzer, there is, for example, the invention described in Japanese Patent Publication No. 1-38055. The above invention, as shown in FIG.
Glass material 91 which is a bottomed tube made of glass or quartz
The core 92 is inserted into the inside of the glass material 91, and the suction action of the vacuum pump is constantly applied to the inside of the glass material 91, while the core 92 is gradually lowered and inserted into the electric furnace inside 94 in which the heater 93 for heating is provided on the inner bottom portion. , The glass material 91 to the core 92
It is a method of gradually heat-molding from the bottom side according to.

[0003]

However, the molding method of the prior art has the following drawbacks. That is, since the shape of the bottomed tube is formed into the shape of the cored bar while gradually heating, the cycle time becomes long.

Further, as shown in FIG. 5, a glass material 91
There may be a gap 95 between the core and the core 92. In this gap 95, the glass material 91 gradually increases from the lower side to the core 92.
When it comes into close contact with the core 92, the upper part (suction side) of the close contact part adheres to the core 92, thereby confining the surrounding atmosphere between the glass material 91 and the core 92. It is caused by.

The glass material 91 at the portion where the gap 95 is generated
Is naturally not in contact (close contact) with the core 92. Once such a gap 95 is generated, it cannot be removed by the conventional method. Therefore, the obtained glass cell is core 92
The shape is not transferred well, resulting in a defective product.

It is an object of claims 1 to 3 to provide a glass cell molding method capable of transferring the shape of the core satisfactorily and reliably and shortening the cycle time.

[0007]

According to a first aspect of the invention, a glass cell is formed by inserting a core into the inside of a glass material which is a heat-softened bottomed tube and then sucking the inside of the glass material. In the glass cell forming method, the glass cell is formed by applying pressure to the outside of the glass material during the forming.

The invention of claim 2 is characterized in that a cavity is formed outside the glass material, and a gas is introduced into the cavity to perform molding while applying pressure to the outside of the glass material. It is the method for molding a glass cell described in 1.

The invention of claim 3 is the method of molding a glass cell according to claim 1, wherein the glass material is molded while pressing the outside of the glass material with an outer mold.

[0010]

The operation of claim 1 is to form a glass cell in a short cycle time by applying pressure to the outside of the glass material during forming.

According to the second aspect of the present invention, the glass cell adhered to the core is formed by forming the glass material while applying a gas pressure to the outside of the glass material.

According to the third aspect of the present invention, the glass material is pressed from the outside of the glass material with an outer mold during the molding so as to be more closely attached to the core, and a glass cell which does not require polishing in a subsequent step is molded. .

[0013]

[Embodiment 1] FIG. 1 is a schematic configuration diagram of an apparatus used in this embodiment. Also, description will be made with reference to FIG. In this embodiment,
In a method of forming a glass cell in which a core is inserted into the inside of the glass material that has been softened by heating to suck the inside of the glass material,
This is a method in which a cavity is formed outside the glass material, and a gas is caused to flow into the cavity to apply pressure to the outside of the glass material while molding.

The core 1 is a molding die for molding a glass cell, and is made of cemented carbide such as WC-Ni-Cr, ceramics such as SiC, cermet such as sialon, or SUS.
SUS440 is used as a material, and SUS440 is used in this embodiment. The surface is mirror-finished to have a maximum roughness of 0.1 μm or less, and then coated with chromium nitride. The molding function surface of the core 1 is processed into a quadratic prism shape of 20 × 20 mm, and a step portion A having an outer circumference of φ45 mm is formed on the upper portion. The stepped portion A is provided with screw holes into which the fixing screws 4a and 4b are fitted.

The glass holding member 2 is made of sialon, and is formed into a cylindrical shape having an inner peripheral portion of 29.6 mm and an outer peripheral portion of 45 mm. On the inner surface of the cylinder of the glass holding member 2, a width of 3.2 mm for inserting the O-ring 6 and a depth of 3
A notch of mm is provided, and two through holes into which the fixing screws 4a and 4b are fitted are formed near the outer surface of the cylinder.

The outer wall 3 is a cylindrical member with a bottom for preventing internal pressure from leaking to the outside, and is made of WC-Ni-Cr or other superhard material, S.
It is made of ceramics such as iC, cermet such as sialon, or stainless alloy such as SUS440. SUS440 is used in this embodiment. The inside of the outer wall 3 is processed into a square column shape of 30 × 30 mm. Further, a notch having a diameter of 46 mm and a depth of 5 mm is provided at the upper end portion of the outer wall 3 so that the glass holding member 2 can be mounted. The notch is provided with a screw hole into which the fixing screws 4a and 4b are screwed. The fixing screws 4a and 4b are members that fix the core 1 and the glass holding member 2 to the outer wall 3.

The glass material 5 is made of Pyrex,
It has a bottomed cylindrical shape with an inner diameter of 28.5 mm and a thickness of 1 mm, and its upper end is open. The O-ring 6 is a leak-prevention member, and is made of silicone so that it can expand and contract and withstand high temperatures, and its inner diameter is φ28.2 m.
It has a shape of m and a thickness of 3.5 mm.

The seal member 7 is a member for preventing leakage and is made of a disc-shaped silicone material and has a thickness of 0.5 m.
A circle having a diameter smaller than the inner diameter of the glass holding member 2 is cut out at m. The sealing member 8 is an elastic member for preventing leakage, is made of a ring-shaped silicone material, and is inserted so as to be in close contact between the glass holding member 2 and the cutout portion of the outer wall 3.

One ends of the two suction pipes 9a and 9b are suction ports 10a and 10b provided at the upper part of the core 1, respectively.
It is connected to the. Suction pipes 9a, 9b and suction port 1
It is desirable to use means such as brazing at the connecting portions with 0a and 10b to prevent leakage. The other ends of the suction pipes 9a and 9b are connected to the main suction pipe 12 through a suction cock 11 which is an opening / closing valve used for depressurization. One of the main suction pipes 12 is connected to the suction cock 11, and the other is connected to a vacuum pump (not shown). further,
A gas injection port 21 is provided in the middle of the suction pipe 9 a, and the gas injection port 21 is connected to a gas injection valve 22.

Pressure increasing ports 13a and 13b are provided in the lower portion of the outer wall 3. The pressure increasing ports 13a and 13b are gas inlets that penetrate the side surface of the outer wall 3 and allow gas to flow into the cavity B formed by the inside of the outer wall 3, the glass material 5, and the glass holding member 2. One of the pressure boosting pipes 14a and 14b is connected to the pressure boosting ports 13a and 13b, respectively, and the other of the pressure boosting pipes 14a and 14b is connected to the pressure boosting cocks 15a and 1b.
5b, respectively. Booster cocks 15a, 1
Reference numeral 5b is an on-off valve for allowing gas to flow in at the time of pressure increase, and pressure increase main pipes 16a and 16b are connected to each. The other of the pressure boosting main pipes 16a and 16b is connected to a gas generator (not shown).

A hole is bored in the core 1 along the axis, and a core heater 17 for heating the core 1 is installed in the hole. A lead wire 18 for passing a current is connected to the core heater 17, and the lead wire 18 is connected to a power supply (not shown). A gas vent port 19 is provided in the center of the side surface of the outer wall 3.
It is configured so that the atmospheric pressure can be adjusted with the outside by opening and closing the gas vent valve 20 provided in the.

In the molding using the apparatus having the above structure, first, the glass material 5 is mounted on the glass holding member 2 having the O-ring 6 mounted thereon, and the glass material 5 is inserted into the outer wall 3. Next, the seal member 8 is inserted between the inner wall of the cutout portion of the outer wall 3 and the outer peripheral surface of the glass holding member 2. Subsequently, the seal member 7 is placed on the glass holding member 2, the stepped portion A of the core 1 is placed on the seal member 7, and the core 1 and the glass holding member 2 are cut on the outer wall 3 by the fixing screws 4a and 4b. Fix it in the notch. At this time, the sealing member 7 is firmly tightened and pressure-bonded so that no gap is created between the glass holding member 2 and the stepped portion A of the core 1.

Next, heating of the outer wall 3 is started by a high-frequency heating device (not shown). At the same time, heating of the core 1 is started by the core heater 17. At this time, the glass material 5 is heated by the radiant heat of the outer wall 3 and the core 1 and the heat transfer from the inner bottom portion of the outer wall 3 and the outer bottom portion of the core 1.

Next, gas is introduced into the pressure boosting main pipes 16a and 16b by a gas generator (not shown). This time,
The pressure increasing cocks 15a and 15b and the gas vent valve 20 are closed. Further, it is better to use a non-oxidizing gas such as an inert gas as the inflowing gas, and in this embodiment, nitrogen gas was used. The air pressure in the pressure boosting main pipes 16a, 16b is kept at least equal to or higher than the atmospheric pressure immediately before opening the pressure boosting cocks 15a, 15b described later.
It was set to 0 Pa.

Next, suction in the main suction pipe 12 is started by a vacuum pump (not shown). At this time, the suction cock 11 and the gas injection valve 22 are closed. The air pressure inside the suction main pipe 12 is sucked so as to be 0.1 Pa or less just before the start of vacuum suction, and is 0.0 in this embodiment.
It was sucked up to 5 Pa.

The viscosity of the glass material 5 is 4.5 × 10 ⁷ Pa
Immediately after reaching s, the pressure increasing cocks 15a and 15b and the suction cock 11 are opened. By opening the pressure boosting cocks 15a, 15b, the nitrogen gas in the pressure boosting main pipes 16a, 16b flows into the cavity B formed by the inner surface portion of the outer wall 3 and the outer surface portion of the glass material 5 all at once. The pressure inside the cavity B is increased.

Further, since the suction cock 11 is opened, the gas in the cavity C formed by the outer surface of the core 1 and the inner surface of the glass material 5 is kept at 0.05 Pa. The inside of the cavity C is depressurized. Due to the pressure increasing action from the outer surface side and the pressure reducing action from the inner surface side, the glass material 5 is adhered to the core 1 to be molded into a desired square prism-shaped glass cell.

As described in the above-mentioned prior art, the gap 95 shown in FIG. 5 may occur during molding. When the above gap 95 occurs, the glass material 5 (91 in FIG. 5)
The pressure of the atmosphere outside of the
Although it acts on the atmosphere inside, when the adhesive force between the glass material 5 around the gap 95 and the core 1 (92 in FIG. 5) is more than that, the pressure of the atmosphere inside the gap 95 is equal to that of the glass material 5. Child 1
However, the gap 95 is not removed.

In this embodiment, nitrogen gas is introduced into the cavity B during molding to give a pressure higher than usual to the outside of the glass material 5, and the inside of the gap 95 is heated through the softened glass material 5. Apply pressure to the atmosphere. By applying this pressure, the adhesion of the glass material 5 around the gap 95 is destroyed, the atmosphere in the gap 95 is sucked, and the glass material 5 adheres to the core 1.

In short, even if the gap 95 as shown in FIG. 5 is generated, in this embodiment, the action of increasing the pressure of nitrogen gas from the outside of the glass material 5 is confined through the glass material 5 which has been softened by heating. By increasing the pressure, the close contact around the gap 95 is broken, and the enclosed atmosphere is released and sucked.

According to this embodiment, even if the ambient atmosphere is confined inside the glass material and a gap is generated between the glass material and the core, the nitrogen gas presses the outside of the glass material. The glass material can be firmly attached to the core by pushing out the atmosphere enclosed in the gap. Therefore, the shape of the core can be satisfactorily and reliably transferred to the glass material.

[0032]

[Embodiment 2] FIGS. 2 and 3 show an apparatus used in this embodiment, FIG. 2 is a schematic configuration diagram, and FIG. 3 is an enlarged sectional view of an essential part. In this embodiment, the same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. The present example is a method of molding a glass cell in which a core is inserted into the inside of a glass material that has been softened by heating and the inside of the glass material is sucked, and a method of molding while pressing the outside of the glass material with an outer mold. .

The core 51 is a mold for molding a glass cell, and the molding function surface used for molding is 20 × 20 mm.
2 is processed into a rectangular prism shape, and a tapered portion D is provided on the upper outer peripheral portion as shown in FIG. Further, suction ports 51a and 51b are provided inside the upper outer peripheral portion for sucking the gas inside when the pressure is reduced. The core 51 is held by the core holding member 36. The core holding member 36 is connected to the core slider 37, the core slider 37 slides on the slider 40, and the core 51 is movable in the vertical direction. Further, a hollow connection member 35 for connecting the suction pipe 9 and the core 51 is attached to the upper end of the core 51.

The glass holding member 52 is made of sialon. The upper inner peripheral surface of the glass holding member 52 is provided with a tapered portion D of the core 51 and a tapered portion E which is fitted at the time of molding, as shown in FIG. As shown in FIG. 3, the tip is notched so that the suction ports 51a and 51b of the core 51 are not blocked. Further, the glass holding member 52 is attached to the glass holding member arm 38 connected to the glass material slider 39, and the glass material slider 39 slides on the rail 40, whereby the glass holding member 52 is vertically moved. It is configured so that it can move in any direction.

The core heater 24 has a cylindrical shape,
It is held by the core heater holding member 26, and the heater wire 23 is spirally wound inside. The core heater holding member 26 is attached to a cylinder heater cylinder rod 27, and is horizontally operated by a core heater cylinder 28 that is operated by hydraulic, pneumatic or electric means. The cylinder heater cylinder 28 is a rail 34
The core heater 24 is attached to a slider 29 for the core heater that slides on the top, and the core heater 24 is configured to be movable in the vertical direction in accordance with the sliding of the slider 29 for the core heater.

The glass material heater 25 has a cylindrical shape, is held by the glass material heater holding member 30, and a heater wire 46 is spirally wound inside.
The glass material heater holding member 30 is attached to a glass material heater cylinder rod 31, and is horizontally operated by a glass material heater cylinder 32 which is operated by hydraulic, pneumatic or electric means. The glass material heater cylinder 32 is attached to a glass material heater slider 33 that slides on a rail 34, so that the glass material heater 25 can move in the vertical direction in accordance with the sliding of the glass material heater slider 33. Is configured.

The outer mold 41a is a mold for molding a glass cell, and is made of cemented carbide such as WC-Ni-Cr, ceramics such as SiC, cermet such as sialon, or SU.
It is formed by using a stainless alloy such as S440 as a material. In this embodiment, SUS440 is used to form 22 × 22 ×.
It is processed into a 3 mm quadrangular prism shape, and the upper surface, which is a molding function surface, is processed into a mirror surface with a maximum roughness of 0.1 μm or less.
Further, the entire surface is covered with chromium nitride.

The outer molds 41b and 41c are molds for molding the glass cell, and are made of WC-Ni-Cr or the like, which is a superhard material, or S.
It is made of ceramics such as iC, cermet such as sialon, or stainless alloy such as SUS440. In this embodiment, SUS440 is used.
It is processed into a square column shape of × 105 × 3 mm, and the side surface, which is a molding function surface, is processed into a mirror surface with a maximum roughness of 0.1 μm or less. Further, the entire surface is covered with chromium nitride.
Outer molds 41d and 41e having the same structure as the outer molds 41b and 41c are arranged on the front side and the back side of FIG. 2, respectively.

Outer mold heaters 42a, 42b, 42c for heating the outer molds 41a, 41b, 41c are attached to the opposite surfaces of the molding function surfaces of the outer molds 41a, 41b, 41c, respectively. Then the outer heater 42
Ceramic heaters were used as a, 42b and 42c. The outer heater 42a is fixed, but the outer heaters 42b and 42c are outer cylinder rods 43b and 43c.
It is attached to each of c. The outer die cylinder rods 43b and 43c are slidably attached to the outer die cylinders 44b and 44c, and the outer die cylinders 44b and 44c are attached to the outer die cylinder fixing members 45b and 45c.

Although not shown, the outer cylinders 41d and 41e on the front side and the rear side in FIG. 2 are also fixed to the outer die fixing member via the outer die heater, the outer die cylinder rod, and the outer die cylinder. There is. Four outer molds 4 excluding outer mold 41a
1b, 41c, 41d, and 41e are configured to be movable in the horizontal direction by operating the outer cylinders.

In the molding using the apparatus having the above structure, first, the core 51 is moved to the thickness of 1 m by the core heater 24.
m of the glass material 5 is used by the glass material heater 25, and the outer molds 41a, 41b, 41c, 41d, 41e are omitted by the outer mold heaters 42a, 42b, 42c.
Each is heated by two external heaters. The heating temperature of the glass material 5 is such that the glass material 5 has a viscosity of 10 ^{3 to} 4.5 × 10 ⁷ Pa · s. Since Pyrex was used in this example, it was heated to 860 ° C. and 4.5 × 10 ⁷ Pa · s
And the viscosity.

Further, the core 51 and the outer molds 41a, 41
b, 41c, 41d, and 41e are heated to near the glass transition temperature (glass viscosity: 10 ^12.5 Pa · s). In this embodiment, the temperature is set to 510 ° C., which is 50 ° C. lower than the glass transition temperature of Pyrex. Immediately after the heating is completed, the core heater slider 29 and the glass material heater slider 33 are lowered.

When the upper end of the core heater 24 is lowered to a position where it does not contact the lower end of the core 51, the lowering of the core heater slider 29 is stopped. Similarly, the upper end of the glass material heater 25 does not contact the lower end of the glass material 5, and the lower end of the glass material heater 25 is the outer mold 4
When the glass material heater 25 descends to a position where it does not hinder the movement of the outer dies 41b, 41c, 41d, 41e except 1a, the descending of the glass material heater slider 33 is stopped.

Next, the core heater cylinder 28 is operated to move the core heater 24 to the right in FIG. Similarly, the glass material heater cylinder 32 is operated to move the glass material heater 25 to the right in FIG. The core heater 24 moves the core 5
It is the amount up to a position where the core 51 and the connecting member 35 do not come into contact with the core heater 24 when the core slider 37 is moved down sufficiently after deviating from the orbit of No. 1. Similarly, when the glass material heater 25 is sufficiently disengaged from the orbits of the core 51 and the glass material 5 and the core slider 37 and the glass material slider 39 are lowered, the core 51, the connecting member 35, and the glass material 5 and the glass holding member 52 up to the position where the glass material heater 25 does not come into contact with the glass material heater 25.

By this time, with the suction cock 11 closed, the suction main pipe 12 is sucked by a vacuum pump (not shown) so that the air pressure in the main pipe 12 is 0.1 Pa or less. In this example, suction was performed up to 0.05 Pa. Next, the slider 37 for the core is started to descend and the core 5 is inserted into the glass material 5.
Insert 1. When the lower end of the core 51 reaches the inner lower end of the glass material 5, the glass material slider 39 starts to descend.

After that, the descending speeds of the core slider 37 and the glass material slider 39 are made equal to each other. As a result, the core 51 and the glass material 5 are integrally lowered. At this time, the taper portion D of the core 51 and the taper portion E of the glass holding member 52 are fitted to each other to be in the state shown in FIG. When the space between the core 51 and the outer die 41a becomes a desired distance, the lowering of the core slider 37 and the glass material slider 39 is stopped. In this embodiment, the glass material 5 having a thickness of 1 mm is used, and the lowering is stopped at the position where the distance between the core 1 and the outer die 41a is 0.8 mm. Therefore, the lower end of the glass material 5 is pressed by the outer die 41a, and the molding surface of the outer die 41a is transferred.

Next, the outer die cylinders 44b, 44c
Then, the driving of the two omitted outer cylinders is started, and immediately after the molding function surface comes into contact with the glass material 5, the suction cock 11 is opened to open the glass material 5 and the glass holding member 5.
The depressurization of the cavity formed by 2 and the core 51 is started. At this time, the gas injection valve 22 is closed. Outer mold 41
The glass material 5 is pressed into each of the outer dies 41b, 41c, 41d, 41e other than a and simultaneously the pressure inside the cavity is reduced, so that the glass material 5 is in close contact with the core 51 and is formed into a quadrangular prism shape. .

When each outer die 41b, 41c, 41d, 41e reaches the side surface of the outer die 41a, the driving of each outer die cylinder 44b, 44c and the two omitted outer die cylinders are stopped. In the above state, the glass is left to cool until the temperature of the glass becomes equal to or lower than the glass transition temperature. After cooling, the gas injection valve 22 is opened to bring the atmospheric pressure of the space between the core 51 and the molded glass cell to atmospheric pressure.

Next, each outer cylinder 44b, 44c
And, the two outer mold cylinders omitted are driven to release from the molded glass cell. Thereafter, the slider 37 for the core and the slider 39 for the glass material are raised to be released from the outer mold 41a, and the slider 37 for the core is further raised to remove the core 51 from the molded glass cell. After that, the molded glass cell is pulled out from the glass holding member 52 to end the manufacturing process.

According to this embodiment, by using the pressing means by the outer mold as means for increasing the pressure on the outside of the glass material, when depressurizing the cavity formed by the core, the glass holding member and the glass material, Even if there is some leakage, the same molding as in Example 1 can be performed. Also,
By using the pressing means by the outer mold, it is possible to form a highly accurate glass cell that does not require polishing in a subsequent step.

[0051]

[Embodiment 3] In this embodiment, one of the gas transfer pipes (not shown) is connected to the gas injection valve 22 in the first embodiment, and the other of the gas transfer pipes is connected to a gas generator (not shown). The structure is different, and the other parts are the same, and the description of the structure will be omitted and the operation will be described with reference to FIG.

In the apparatus having the above-mentioned structure, the steps up to the start of heating are the same as those in the first embodiment, and therefore the description thereof will be omitted. For heating, the outer wall 3 is heated by a high-frequency heating device (not shown) and the core 1 is simultaneously heated by the core heater 17. At this time, the glass material 5 is heated by the radiant heat of the outer wall 3 and the core 1 and the heat transfer from the inner bottom portion of the outer wall 3 and the outer bottom portion of the core 1.

Next, a gas is introduced into the pressure boosting pipes 14a, 14b and the gas inlet 21 from a gas generator (not shown). At this time, the gas vent valve 20 is closed. It is better to use a non-oxidizing gas such as an inert gas as the inflowing gas, and nitrogen gas was used in this embodiment. Then, the atmospheric pressure outside the glass material 5 and the atmospheric pressure inside the glass material 5 must be at least atmospheric pressure or higher,
In this embodiment, the pressure is 10 Pa. It is desirable to complete this step before the glass has a viscosity of 10 ^12.5 Pa · s at which deformation starts.

Next, suction in the suction main pipe 12 is started by a vacuum pump (not shown). At this time, the suction cock 11 and the gas injection valve 22 are closed. Suction The air pressure in the main pipe 12 is sucked to 0.1 Pa or less just before the start of vacuum suction.
It was sucked up to 5 Pa.

The viscosity of the glass material 5 is 4.5 × 10 ⁷ Pa
• Immediately after reaching s, open the suction cock 11. Since the suction cock 11 was opened, the gas pressurized to 10 Pa in the cavity formed by the outer surface of the core 1 and the inner surface of the glass material 5 was kept at 0.05 Pa. The inside of the cavity is suddenly depressurized by moving to 12 at once. The following steps are the same as in Example 1,
Description is omitted.

According to this embodiment, the pressure inside and outside the glass material is increased before the glass material reaches a viscosity at which the glass material begins to deform, so that the glass does not sag in a softened state. Further, the pressure reduction rate becomes faster by setting the pressure inside the sucked glass material to a high pressure.

[0057]

According to the effect of claim 1, the cycle time for molding a glass cell can be shortened. The effect of the second aspect is that the device can be simplified because the outer mold is not used. The effect of claim 3 is that the glass material softened by using the outer mold can be more closely attached to the core, and a highly accurate glass cell that does not require polishing in a subsequent step can be formed.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram illustrating a first embodiment.

FIG. 2 is a schematic configuration diagram showing a second embodiment.

FIG. 3 is an enlarged cross-sectional view of a main part of the second embodiment.

FIG. 4 is a schematic configuration diagram showing a conventional example.

FIG. 5 is a cross-sectional view showing a conventional example.

[Explanation of symbols]

 1 core 2 glass holding member 3 outer wall 5 glass material 9a, 9b suction pipe 11 suction cock 12 suction main pipe 14a, 14b pressure booster pipe 15a, 15b pressure booster cock 16a, 16b pressure booster pipe 17 core heater 20 degassing Valve 22 Gas injection valve

Claims (3)

[Claims] 1. A glass cell molding method for molding a glass cell by inserting a core into the inside of a glass material that is a bottom tube that has been softened by heating, and then sucking the inside of the glass material to form a glass cell. A method for molding a glass cell, which comprises molding while applying pressure to the outside of the material. 2. A cavity is formed outside the glass material, and a gas is caused to flow into the cavity,
The method for molding a glass cell according to claim 1, wherein the glass material is molded while applying pressure to the outside. 3. The method of molding a glass cell according to claim 1, wherein the glass material is molded while pressing the outside of the glass material with an outer mold.